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The measure is done by looking at the intensity of the light exiting from the interferometer. Looking at the scheme in figure you can suppose for simplicity that the light source inject a plane electromagnetic wave in the input port. The light is splitted in two parts by the beam splitter, and then recombined. If the field at the input port is given by ...


Certainly. Keysight, a spinoff of Agilent , manufacturers metrology laser systems using Zeeman modulated He Ne lasers. The systems provide counters and processing that interpolate with resolution as small as lamda/256. The systems are commonly used for high precision machine, wafer fab, and scientific research. Although interpolation provides a finer ...

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